Epson Stylus Pro 4900/4910 Service & Repair Manual, 2010 (P/N SEIJ10007)

Epson’s service manual for the Stylus Pro 4900 and 4910 large-format color inkjet printers, P/N SEIJ10007, Revision A, first released October 8, 2010. It contains six chapters, including the appendix as Chapter 6.

Text Search, Bookmarks, and Wiring Detail

Search and diagram navigation: The main text is searchable, and embedded bookmarks provide access to service chapters and subsections. Some block wiring diagram labels are not reliably searchable. Small connector and pin labels in these diagrams require zooming for comfortable reading.

One printable English-language, 441-page PDF, including the original cover and seven preliminary pages. The wiring appendix and closing panel-menu maps are included in this total.

Printer Diagnostics, Component Replacement, and Calibration

The following selected service topics outline the manual’s coverage. Other documented functions include operation-panel testing and MAC address registration.

• Fault diagnosis: Maintenance requests, service-call codes, print-quality symptoms, paper-feed faults, inoperative-printer conditions, abnormal operation, and SpectroProofer errors follow cause, check-item, and remedy pathways.

• Component replacement: Step-by-step removal and reassembly procedures cover housing, electrical boards, carriage and paper-feed mechanisms, ASF and roll units, and cutter assemblies.

• Ink system service: Printhead, IS Unit, Ink Selector, cartridge holders, ink tubes, wiper, and cap procedures include related checks and replacement-dependent adjustments.

• Alignment and adjustment: Procedures cover platen-gap checks, head ID registration, head-slant alignment, Auto Bi-D, CR/PF belt adjustment, media-feed correction, and motor/encoder diagnosis.

• SpectroProofer repair: Coverage includes the mounter, color measurement device, backing replacement, sensor and movement checks, measurement-precision testing, and colorimetric calibration.

• Electrical references: Separate Main Body and SpectroProofer block wiring diagrams accompany twelve connection-diagram sections covering printer and color-measurement assemblies.

This manual is written for experienced repair technicians. Epson specifies that repairs should be performed only by an Epson-certified repair technician.

Printer Configuration and Service Modes

The factory overview explains the pigment-ink arrangement, Photo Black/Matte Black selector, independent ink-suction system, and AID automatic missing-dot detection. It also documents control-panel functions, USB and Ethernet hardware, and the PXBMB1/PX17MB1 maintenance-box specification.

Setup, Maintenance, and Serviceman Mode references distinguish panel checks from operations requiring the separate Service Program.

Troubleshooting and Component Repair

Preliminary checks combine usage-environment review, NVRAM history, and test-print evaluation. The service-call matrix addresses carriage, paper-feed, ink-supply, APG, roll-feed, release, cutter, ASF, edge-guide, AID, head, board-communication, firmware, NVRAM, and power-supply failures.

Symptom tables address nozzle clogging, banding, smearing, color inconsistency, paper jams and skew, incorrect cut position, network recognition, abnormal noise, and failed color measurement.

The diagnostic paths connect faults to connector locations, sensor or encoder checks, motor measurements, belt or feed adjustments, NVRAM data, and related removal pages. That helps distinguish a CR Encoder or PF Scale fault from a Main Board, SUB board, IS Unit, Ink Selector, cutter, or complete printer-mechanism problem before parts are ordered.

Removal and reassembly: Ten disassembly-flowchart groups organize access to the assemblies. Detailed procedures include the Main, Network, Power Supply, SUB-series, and AID boards; CR Unit and belt; PF motor and scale; suction fan; paper sensors; ASF rollers; ATC and roll-feed motors; and cutter drive.

Factory-aligned components: Epson prohibits disassembly of the frame, platen, and PF shaft because these components are aligned to fine tolerances at the factory.

Ink Path and SpectroProofer Assemblies

Ink-system procedures extend to the Head FFC and decompression pump, with ink eject, initial charge, Ink Selector movement checks, ILS/CSIC checks, tube cleaning, and leak inspection.

Damaged, contaminated, or omitted O-rings at ink-path joints can cause leakage. Angled FFC insertion can damage connector terminals and short board circuitry.

SpectroProofer components: The repair sections cover the white calibration tile holder, selectable backing, Main-C Board, CR motor and home-position sensor, paper-pressing motor and encoder, thermistor, and drying fan. Adjustment coverage also includes serial-number input for the unit.

Adjustment Dependencies and Service Tools

Repair-dependent adjustment tables identify the checks required after components are removed or replaced. Carriage procedures include FFC position verification, CR speed initialization, Active Damper adjustment, and Ink Mark Sensor checks; head procedures include nozzle cleaning and CR/PF-direction slant correction.

Media and board checks: Additional procedures cover paper-thickness sensor positioning, Rear AD adjustment, media-eject correction, PW and top/bottom/side detection, cut-position correction, suction calibration, USB/network communication checks, Motor Measurement Adjustment, Sensor Check, and Encoder Check.

NVRAM read/write functions cover both the printer and SpectroProofer EEPROM. The viewer documents life-part counters, utilization history, and stored error history. Firmware installation and counter-reset procedures are also included.

Required tooling: The manual identifies Sonic Tension Meter U-507 P/N 1294120, paper-thickness tools 1424364 and 1282355, PG height jigs 1543007, 1507506, and 1507277, Standard Sheet 1476228, and Cleaning Cartridge 1537913.

The Service Program instructions document the original Windows XP/Vista/7 environment over USB or network. The high-precision ID adjustment tool is identified as separately supplied from the Service Program.

Maintenance and Connection References

Maintenance coverage includes storage and transportation preparation, ink-path cleaning, printhead and wiper/flushing-box cleaning, platen suction-hole cleaning, and SpectroProofer cleaning. Lubrication tables identify the applicable points, lubricants, and service conditions.

Connection references include the Carriage Mechanism, Paper Feed Mechanism 1 and 2, Ink System Mechanism 1 and 2, and SpectroProofer Connection Diagram. These link cable numbers and board connectors to assembly illustrations.

Because the power switch is on the secondary side of the circuit, unplug the AC cable and follow the manual’s electrical-isolation precautions before internal service.

Examples of Belt-Tension Specifications

The PF Belt Adjustment section specifies a standard tension of 13 ± 1.5 N, evaluated from readings at two belt positions. Its procedure uses the Sonic Tension Meter U-507 together with the Service Program.

For the cutter belt, the specified range is 13–19.5 N, based on the average of three measurements on the upper belt span. These are separate component-specific checks with their own measurement conditions.